[BUG] Build fails with Error: Unknown field target

[JasonGross]

Describe the bug

$ opam install wasm_of_ocaml-compiler

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[wasm_of_ocaml-compiler.5.3.0] synchronised (no changes)

The following actions will be performed:
  ∗ install dune                   3.11.1   [required by wasm_of_ocaml-compiler]
  ∗ install cmdliner               1.2.0    [required by wasm_of_ocaml-compiler]
  ∗ install seq                    base     [required by yojson]
  ∗ install stdlib-shims           0.3.0    [required by ppxlib]
  ∗ install sexplib0               v0.16.0  [required by ppxlib]
  ∗ install ppx_derivers           1.2.1    [required by ppxlib]
  ∗ install ocaml-compiler-libs    v0.12.4  [required by ppxlib]
  ∗ install menhirSdk              20230608 [required by wasm_of_ocaml-compiler]
  ∗ install menhirLib              20230608 [required by wasm_of_ocaml-compiler]
  ∗ install cppo                   1.6.9    [required by yojson]
  ∗ install gen                    1.1      [required by sedlex]
  ∗ install ppxlib                 0.31.0   [required by wasm_of_ocaml-compiler]
  ∗ install menhir                 20230608 [required by wasm_of_ocaml-compiler]
  ∗ install yojson                 2.1.1    [required by wasm_of_ocaml-compiler]
  ∗ install sedlex                 3.2      [required by wasm_of_ocaml-compiler]
  ∗ install js_of_ocaml-compiler   5.3.0*   [required by js_of_ocaml]
  ∗ install js_of_ocaml            5.3.0*   [required by wasm_of_ocaml-compiler]
  ∗ install wasm_of_ocaml-compiler 5.3.0*
===== ∗ 18 =====
Do you want to continue? [Y/n] y

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
⬇ retrieved cmdliner.1.2.0  (cached)
⬇ retrieved cppo.1.6.9  (cached)
⬇ retrieved gen.1.1  (cached)
⬇ retrieved js_of_ocaml.5.3.0  (no changes)
⬇ retrieved dune.3.11.1  (https://opam.ocaml.org/cache)
⬇ retrieved js_of_ocaml-compiler.5.3.0  (no changes)
⬇ retrieved menhir.20230608  (cached)
⬇ retrieved menhirLib.20230608  (cached)
⬇ retrieved menhirSdk.20230608  (cached)
⬇ retrieved ocaml-compiler-libs.v0.12.4  (cached)
⬇ retrieved ppx_derivers.1.2.1  (cached)
∗ installed cmdliner.1.2.0
∗ installed seq.base
⬇ retrieved sedlex.3.2  (cached)
⬇ retrieved stdlib-shims.0.3.0  (cached)
⬇ retrieved ppxlib.0.31.0  (https://opam.ocaml.org/cache)
⬇ retrieved sexplib0.v0.16.0  (https://opam.ocaml.org/cache)
⬇ retrieved yojson.2.1.1  (https://opam.ocaml.org/cache)
⬇ retrieved wasm_of_ocaml-compiler.5.3.0  (no changes)
∗ installed dune.3.11.1
∗ installed ppx_derivers.1.2.1
∗ installed gen.1.1
∗ installed menhirLib.20230608
∗ installed menhirSdk.20230608
∗ installed cppo.1.6.9
∗ installed sexplib0.v0.16.0
∗ installed stdlib-shims.0.3.0
∗ installed ocaml-compiler-libs.v0.12.4
∗ installed yojson.2.1.1
∗ installed menhir.20230608
∗ installed ppxlib.0.31.0
∗ installed sedlex.3.2
[ERROR] The compilation of js_of_ocaml-compiler.5.3.0 failed at "dune build -p js_of_ocaml-compiler -j 7 @install".

#=== ERROR while compiling js_of_ocaml-compiler.5.3.0 =========================#
# context     2.1.5 | linux/x86_64 | ocaml-option-fp.1 ocaml-variants.4.14.1+options | pinned(git+file:///home/jgross/Documents/GitHub/wasm_of_ocaml#main#f517bbcafd81de486cf9951f401bd45a69ec4ae8)
# path        ~/.opam/4.14.1+fp+wasm/.opam-switch/build/js_of_ocaml-compiler.5.3.0
# command     ~/.opam/opam-init/hooks/sandbox.sh build dune build -p js_of_ocaml-compiler -j 7 @install
# exit-code   1
# env-file    ~/.opam/log/js_of_ocaml-compiler-17052-6567ab.env
# output-file ~/.opam/log/js_of_ocaml-compiler-17052-6567ab.out
### output ###
# File "dune", line 15, characters 4-10:
# 15 |    (target wasm)))
#          ^^^^^^
# Error: Unknown field target



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build js_of_ocaml-compiler 5.3.0
└─
┌─ The following changes have been performed (the rest was aborted)
│ ∗ install cmdliner            1.2.0
│ ∗ install cppo                1.6.9
│ ∗ install dune                3.11.1
│ ∗ install gen                 1.1
│ ∗ install menhir              20230608
│ ∗ install menhirLib           20230608
│ ∗ install menhirSdk           20230608
│ ∗ install ocaml-compiler-libs v0.12.4
│ ∗ install ppx_derivers        1.2.1
│ ∗ install ppxlib              0.31.0
│ ∗ install sedlex              3.2
│ ∗ install seq                 base
│ ∗ install sexplib0            v0.16.0
│ ∗ install stdlib-shims        0.3.0
│ ∗ install yojson              2.1.1
└─

The former state can be restored with:
    /usr/local/bin/opam switch import "/home/jgross/.opam/4.14.1+fp+wasm/.opam-switch/backup/state-20231119060706.export"

Expected behavior
It should build

Versions
Version of packages used to reproduce the bug

$ ocamlc -v
The OCaml compiler, version 4.14.1
Standard library directory: /home/jgross/.opam/4.14.1+fp+wasm/lib/ocaml

[hhugo]

You need a custom version of dune. See ocaml/dune#8278

[vouillon]

I have updated the README file to indicate that you have to pin a custom version of dune:

opam pin add dune.3.11 https://github.com/ocaml-wasm/dune.git

[JasonGross]

I have updated the README file to indicate that you have to pin a custom version of dune:

opam pin add dune.3.11 https://github.com/ocaml-wasm/dune.git

This actually isn't enough, since it pins dune but not, e.g., dune-configurator. I think it should be opam pin add https://github.com/ocaml-wasm/dune.git?

[JasonGross]

Hm, but this doesn't work either because then js_of_ocaml-compiler fails with Error: Version 3.11 of the dune language is not supported.

[JasonGross]

Maybe opam pin add 'https://github.com/ocaml-wasm/dune.git#wasm'?

[JasonGross]

Maybe opam pin add 'https://github.com/ocaml-wasm/dune.git#wasm'?

Yep, this one works for me

[JasonGross]

Hm, it worked locally, but on CI I'm getting

$ opam pin add -y 'https://github.com/ocaml-wasm/dune.git#wasm' # success
[ ...] 
$ opam pin add -y --debug-level=3 https://github.com/ocaml-wasm/wasm_of_ocaml.git
[...]
00:15.125  CLIENT                 conflict!
[ERROR] Package conflict!
00:15.125  CUDF                   Conflict reporting
  * Missing dependency:
    - js_of_ocaml < 1.2
    no matching version
[NOTE] Pinning command successful, but your installed packages may be out of sync.

Any idea what's generating the js_of_ocaml < 1.2 dependency?